// import com.alibaba.druid.sql.visitor.SQLASTVisitor;
#pragma once
#include "SQLConstraintImpl.h"
#include "SQLColumnConstraint.h"

class SQLNullConstraint : virtual public SQLConstraintImpl, virtual public SQLColumnConstraint
{
public:
  SQLNullConstraint();
  SHAREDOBJECT(SQLNullConstraint);

  // @Override
  void accept0(SQLASTVisitor_ptr visitor);

  SQLObject_ptr clone();
};
